have a new diet for carb lovers. You're not buying it yet. You can eat as m as you want as long as you stay away from sugar. 100 diet. How many sugar calories you can take in and "nightline's" juju chang met with the man who created it. Reporter: Low carb diets are the rage, atkins or the caveman diet. This is a low carb diet for carb lovers who can have 3wr5eds and cakes and get this, the diet guru says hundreds of folks who try it lose on average 18 pounds in just two weeks. I met up with jorge crui the man behind the new diet book, "the 100," at trump soho in new york city. What is the breakthrough dietary science behind it. Insulin. Everyone thinks weight loss is all about eat less exercise more. A calorie is a calorie and as much as I love equality I'm not about equality when it comes to calories. Not all calories are the same. Reporter: In his diet it's only the sugar calories that count. So what is the overarching rule for a daily intake for sugar? No more than 100 sugar calories a day. Reporter: But lots of foods you think are healthy are loaded with hidden sugar like brown rice or fruit. So here's a formula. Total carbs times four. Fits 20 total carbs in an apple. Times by four, 80 sugar calories. Reporter: So you eat this and your sugar calories done. Not many left. Reporter: Even reading a nutritional label can be tricky. Zero sugar as far as this is concerned. And lots of fiber. And lots of fiber. Great for me but you're saying not so fast. I say take a look. There's 35 grams of carbs. Right. Take 35 times four. That's a lot. Corps carbaholics you can swap out wheat flour for almond flower, flaxseed or coconut oil to make a no sugar recipe. This is the no calorie chocolate cake made at home in two minutes. If you whip you will almond flour, truvia, coconut oil and a few other ingredients, after one minute, voila. No sugar calories. So cheers. Hasalut.

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